the quest To the Nether! is stuck i cant get the rewards and go on.

This seems to be a bug with FTB Quests. I was not able to recreate this in my solo player world.

To complete this, if you are on a solo world: use the command /ftbquests change_progress (playername) complete 0B8213C1DDCC540F

Player name is case sensitive, and there should not be any () with it.

THX

I'm having the same bug but it's saying this?
it's saying there's no command for that?

This was determined to be an active bug due to FTBQuests.

The quest will be changed to require items instead of a dimension requirement.

The issue can be tracked here on the FTB Issues github.